If you guys want to spend a day working it out, you welcome to...
Oh come on, its about helping each other out. I've helped people on this thread with questions for example and on the ocr chemistry F324 thread I spent ages doing the same (collating questions) for everyone else to use as well-check if you don't believe me. But you spent the time doing it, so it's your choice. Good luck either way
Hi all, I hope someone can help me out... The question is regarding capacitance.
A capacitor is discharges through a fixed resistor, how long does it take the pd across the capacitor to fall from V_0 from V? (Assuming all values are known, aside the time)
I thought you would use the equation below, but I can't rearrange for t :'( (Never did maths)
Hi all, I hope someone can help me out... The question is regarding capacitance.
A capacitor is discharges through a fixed resistor, how long does it take the pd across the capacitor to fall from V_0 from V? (Assuming all values are known, aside the time)
I thought you would use the equation below, but I can't rearrange for t :'( (Never did maths)
V=V_0 e^(-t⁄RC)
Thank you in advance
Rearranging V=V_0 e^(-t⁄RC) for t is simple if you do A-level maths, but since you don't here it is
t=RC In(V_0/V), In is the inverse of the exponential function.
no not really... we did it as a mock and have been through it and i don't remember any errors...
i noticed 1 error. q14 it says work out the electic potential energy
now to to this u would usually do v=q/4piepsilon0r then sub v into w=qv to find the energy.
so this question should actually be work out the electric potential. the word energy should not be there. also another less relevant point is that energy is a scalar so there is no need for the +/- signs.
i noticed 1 error. q14 it says work out the electic potential energy
now to to this u would usually do v=q/4piepsilon0r then sub v into w=qv to find the energy.
so this question should actually be work out the electric potential. the word energy should not be there. also another less relevant point is that energy is a scalar so there is no need for the +/- signs.
i didn't take into consideration the multiple choice paper so there may be mistakes in the paper then...
Can anyone help me out on question 2? I've tried everything! It'll be something simple probably.
Also for question 21, I used BANcosθ and got 3.8x10^-3 Wb turns, so I assumed the flux linkage would increase by this amount. The answer is in fact B, can anyone explain why?
Also for question 21, I used BANcosθ and got 3.8x10^-3 Wb turns, so I assumed the flux linkage would increase by this amount. The answer is in fact B, can anyone explain why?